Structural Health Monitoring using Frequency Response Correlation Criteria

C Zang (Imperial College, London), MI Friswell (University of Bristol) & M Imregun (Imperial College, London)

ASCE Journal of Engineering Mechanics, Vol. 133, No. 9, September 2007, pp. 981-993


Two frequency response correlation criteria, namely the global shape correlation (GSC) and the global amplitude correlation (GAC) functions, have been used to quantify the correlation between predictions from an FE model and measured data for the purposes of FE model validation and updating. This paper extends the application of the two frequency response correlation criteria to structural health monitoring and damage detection. In addition, window-averaged versions of the GSC and GAC, WAIGSC and WAIGAC, are defined as effective damage indicators to quantify the change in structural response. An integrated method of structural health monitoring and damage assessment, based on frequency response correlation functions and radial basis function neural networks, is proposed and the technique is applied to a bookshelf structure with 24 measured responses. The undamaged and damaged states, single and multiple damage locations, as well as damage levels, were successfully identified in all cases studied. The ability of the proposed method to cope with incomplete measurements is also discussed.

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This material has been published in the ASCE Journal of Engineering Mechanics, Vol. 133, No. 9, September 2007, pp. 981-993. Unfortunately the copyright agreement with ASCE does not allow for the PDF file of the paper to be available on this website.

Link to paper using doi:10.1061/(ASCE)0733-9399(2007)133:9(981)

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